Side by side
Happo vs Loki
Both stand on visual testing. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan AndroidAPIiPhone+2
Happo combines screenshot comparisons with accessibility testing and integrations for common development workflows. The free quota may suit limited use; higher snapshot volumes require a paid plan or an upgrade.
Visit Happo
Free plan AndroidiPhoneLinux+4
Loki offers a defined screenshot-comparison workflow for Storybook projects, with browser and mobile capture options. Check its prerequisites and animation limitations, and ensure required servers are already running before tests.
Visit LokiThe facts
| Happo | Loki | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | No | Not published |
| Runs on | Android, API, iPhone, Self-hosted, Web | Android, iPhone, Linux, Mac, Self-hosted, Web, Windows |
| Lowest paid plan | Starter: $149 a month | Free or on request |
| Plans published | 5 | 1 |
| Maker | Not published | Not published |
| Website | happo.io | loki.js.org |
| On visual testing | #1 of 17 | #3 of 17 |
Happo: what it does well
- Accessibility testing is included on every plan.
- Free plan includes 5,000 monthly snapshots.
- Connects with Storybook, Playwright and Cypress.
- Supports several repository and CI integrations.
- Customer screenshots receive account-level access controls.
What to know first
- Free accounts pause after reaching their monthly quota.
- Paid plans charge $0.006 per additional snapshot.
- GitLab support is labeled experimental.
- Browser availability depends on plan.
Loki: what it does well
- Compares story screenshots with reference images.
- Supports Chrome, iOS simulator, and Android emulator captures.
- Can run in continuous integration.
- Free and MIT-licensed.
What to know first
- Requires Node 16 or later.
- Does not start Storybook or simulator servers.
- Looping animations, GIFs, and SVG animations have documented limits.
- The gm diff engine requires GraphicsMagick.